A connection structure for connecting a wiring board to a to-be-connected body having electric contacts, the wiring board including: a base having board-side contacts provided on its facing surface that is to face the to-be-connected body; and a cover film which covers the facing surface except the board-side contacts and a non-covered partial region of the facing surface, the connection structure including: conduction portions formed of electrically conductive resin, for bonding the electric contacts and the board-side contacts to permit electrical conduction therebetween; and a reinforcement portion formed of the same resin as the conduction portions and disposed at a position which is different from positions of the conductive portions and at which the reinforcement portion extends across both of a surface of the cover film and a surface of the non-covered partial region of the base, the reinforcement portion bonding the to-be-connected body and the wiring board for reinforcing connection therebetween.